US2860127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Start-up of a polymerization process
Assignee: Phillips Petroleum Co
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Filing: 1957-02-06
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Granted: 1958-11-11
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Expires: 1977-02-06
Abstract
No abstract record available.
Inventors
- 👤 Robert L Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:43
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN A PROCESS FOR POLYMERIZING ETHYLENE IN FLUIDIZED CATALYST SYSTEM WITH A CHROMIUM OXIDE SUPPORTED CATALYST HAVING A HIGH INITIAL ACTIVITY, THE METHOD OF MODIFYING SUCH INITIAL ACTIVITY WHICH COMPRISES CONTACTING SAID CATALYST AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER BEING FORMED WITH ETHYLENE AT A PRESSURE NOT
Claim 2
Dependent Claim
51 words
IN A PROCESS FOR POLYMERIZING ETHYLENE IN FLUIDIZED CATALYST SYSTEM WITH A CHROMIUM OXIDE SUPPORTED CATALYST HAVING A HIGH INITIAL ACTIVITY, THE METHOD OF MODIFYING SUCH INITIAL ACTIVITY WHICH COMPRISES CONTACTING SAID CATALYST AT A TEMPERATURE BELOW THE MELTING POINT OF THE POLYMER BEING FORMED WITH ETHYLENE AT A PRESSURE NOT
References Cited (Backward Citations)
US2692261A
Cited
US2691647A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |